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Sometimes you will find when the rail comes off it pulls the injectors with it anyway so you dont always get a choice, but its a simple affair refitting them anyway.
Use a thing smear of grease if they feel like they dont want to go.
If they are a bit reluctant to come out, a little spray of WD40 helps and some silicon grease on the o-rings helps to refit (the grease is cheap bought from a scuba shop).